The initial degradation of plants by microarthropods, bacteria, and fungi occurs in the soil horizon. view available hint(s) the initial degradation of plants by microarthropods, bacteria, and fungi occurs in the soil horizon. o r a b

O.

Explanation:

There are different types of soils and it is made up of different layers or horizon such as A, B, C, O, R and E. Together all the horizons forming soil profile. Each horizon containing different soil types.

O horizon: Known as top layer of the soil which contains layer of organic matter which is about two inches thick, and made up of humus such as decomposing leaves, dark-colored, carbon rich matter, twigs and microbial biomass which is mixed with small grained minerals for the formation of aggregate structures.